Isolation and Identification of Antioxidative Active Component from Total Flavonoids of Mimenghua

In this study, bioassay-guided isolation, identification and biological evaluation of antioxidant components from total flavonoids of Chinese herbal plant Mimenghua were performed. 1, 1-Diphenyl-2-picrylhydrazyl (DPPH) radical scavenging test was adopted as the bioassay-guided method, Sephadex LH-20 column chromatography and high performance liquid chromatography were used as the purification tools for the acquisition of antioxidant components. One compound was obtained and identified as acteoside by its physicochemical properties and spectral characteristics. Antioxidant activity in vitro of acteoside was determined by evaluation of the scavenging activity on DPPH radical and hydroxyl radical, reducing power and total antioxidant capability.The results showed that acteoside had significant antioxidative activity and possessed higher activity with the increase of concentration,which provides the potential application of acteoside in food, pharmaceutical and cosmetic industries.     

渗透胁迫下外源试剂对玉米幼苗微粒体膜Ca^2＋-ATPase活性的影响

以钙离子鳌合剂EGTA、钙通道阻断剂vp、钙调素拮抗剂TFP和ABA分别处理玉米幼苗,对渗透胁迫下根系和叶片质膜、液泡膜、线粒体膜以及总微膜Ca2 -A11)ase活性进行了测定.结果表明,正常条件下,叶片和根系微膜系统总Ca2 -ATPase活性随光照时间延长出现一个峰值.总体比较,渗透胁迫下三种膜上Ca2 -ATPase活性相当,而且均随渗透胁迫发生不同程度的变化.就微膜系统总酶活变化而言,叶片高于根系,渗透胁迫降低叶片酶活;而渗透胁迫对根系酶活性影响不大.分解列三种膜上,渗透胁迫对叶片酶活的提高均表现为正效应,根系上.对线粒体膜和液泡膜酶活提高表现为正效应,而对质膜酶活表现为显著抑制.外源试剂处理发现,ABA和EGTA在叶片上均可逆转PEG降低总酶活的效应,且在处理6 h时使得酶活性显著超过正常水平;而根系上表现不一:其中,vp对质膜上PEG提高酶活效应抑制作用较大.且显著提高线粒体膜酶活;ABA显著提高液泡膜上酶活性;TFP处理在胁迫前期基本表现为促进作用,而6 h之后大都表现为抑制效应.说明:渗透胁迫下,玉米叶片质膜、液泡膜以及线粒体膜均参与了胞质钙离子稳态的调控过程,外源试剂处理对Ca2 -ATPase具不同程度的调节作用,叶片和根系Ca2 -ATPase对外源试剂响应存在差异性.     

Character of Coalbed Methane Enrichment Controlled by Hydrological Geology in Libi Gorge Anticlines

The drain character and hydraulic linking are studied by analyzing the property of water-bearing and water-resisting, groundwater flowing and hydrochemistry character in Libi Gorge anticline. According this, the character of methane enrichment controlled by hydrological geology in the region is researched. It is indicated that Libi Gorge belongs to block anticline gas pool sealed by water pressure. In shallow layers, the water-bearing layers are controlled obviously by atmospheric water. The groundwater flows actively, drains nearby, but has no influence on the coalbed methane; in middle layers, the coal-bearing layers contain water weakly and the water flows slowly. The water has a roof and bottom enclosed effect on gas in water network ; in deep layers, the layers contain water weakly. The groundwater stops running and has a bottom enclosed effect on gas in water network. The most of faults are pressure faults, upper of them is water guiding, lower of them resisting. They enclose the gas by pressure. In addition, it is important for thickening rock character to enclose the gas.     

氮素营养诊断技术及其在麻类上的应用研究进展

利用氮素营养诊断技术指导施肥,不仅能最大限度地提高肥料利用率,减少生产成本,还可减少肥料浪费并改善生态环境.氮素营养诊断技术主要包括传统诊断和无损诊断,都用来对作物生长、营养状况进行监测及诊断.但是不同的诊断方法适用范围各不相同,因此在选择时要注意.本文介绍了各氮素营养诊断技术的原理、研究现状及优缺点,重点阐述了氮素无损诊断技术的发展状况及在麻类作物上的应用前景.     

两种仪器对羊毛细度检测结果的比对分析

利用激光细度测定仪和显微投影仪分别检测了国际毛纺协会实验室提供的标准毛条、实验室比对毛条、随机抽取的含脂毛共20个样品的细度,对检测结果比对分析发现,两种方法均可达到羊毛细度检测标准的要求;认为具有相同检测项目的不同仪器间进行比对试验是一种简单易行,及时找到系统误差的好方法;同时得出,在目前多数毛纺织企业和检测机构尚无激光细度仪时,可完全采用显微投影仪进行检测.     

多胺对果树生长发育的影响研究进展

概述了多胺对果树花粉管伸长、坐果、果实发育、根系和衰老的影响,以及多胺与逆境胁迫和植物激素的关系等。     

基于移动通信的林产品运输信息平台开发

基于移动通信的SMS、Mobile Web技术,开发林产品运输信息平台,可实现检尺员上传检尺短信后,实时采伐监控并加强运输监管。该平台有助于运输公司实现物流通知、空车配货,能提高服务质量,降低物流成本。系统架构成本、运营成本低,具有较强的市场竞争力。